Division 4 The measurement points are:
United Kingdom
x1 x2 x3
the thickness of backfat (including rind) in millimetres, measured at 8 cm off the midline of the carcase between the third and fourth last lumbar vertebrae.
the thickness of backfat (including rind) in millimetres, measured at 6 cm off the midline of the carcase between the third and fourth last ribs.
the thickness of muscle in millimetres, measured at the same time and in the same place as x2.
The formulae shall be valid for carcases weighing between 50 and 110 kg.